If billed units is a string, convert back to int

[christopherpickering]

All 835's come in with an int here, and even the default value you have is an int... however, Cigna, in their infinite wisdom, is using floating point as a string, ex: 100.00 or 25.00 to specify the number of units.

This should covert it back to int to match all the other vendor files.

I had to convert to float first as there is a decimal value of "00" always there.